SU973242A1 - Method of mechanical working - Google Patents

Description

(54) METHOD OF MECHANICAL PROCESSING

one

The invention relates to a machine tool industry and can be used for crushing chips during turning of cylindrical and conical parts.

A known method of mechanical treatment in which chip shaving is carried out using the heat of the arc of an electric burner, and shavings into the burner zone are oriented along a special tubular guide, and the crushing is carried out continuously or at a time interval necessary to obtain chips of the required length l.

The disadvantage of this method is the considerable cost of electricity and the relatively low efficiency in processing eccentric parts and blanks with variable allowance.

The inventive concept is to reduce energy consumption for chip separation when processing workpieces with variable allowance,

This goal is achieved by the fact that during the cutting process the radial

the cutting force component and the chip crushing is performed in its minimum cross section with a time delay after the specified cutting force reaches its minimum value by an amount determined from the ratio

 where V is the chip flow rate;

P is the distance from the cutting zone to the chip splitting zone.

FIG. 1 shows a diagram of the implementation of the method of machining; on 4n1g. 2 delay circuit; in fig. 3 is a graph of the radial component P of the cutting force when machining parts with varying allowance per revolution of the part.

Claims (1)

When cutting part 1, a prismatic cutter 2. Jigsaw 3 enters the crushing zone, which can be carried out mechanically (with scissors) or by the heat of the arc of a welding torch. between the electrodes 4 and 5 (Fig. 1) At the same time, the radial component of the cutting force P-6 is monitored and the signal is fed to the measuring device 7, the amplifier 8, the delay line 9, the threshold element 10 (to turn on the electrical circuit 2), in this case, the actuator closes the arc between the electrodes 4 and .5. The amplifier 8, the threshold element 10 and the actuator 1 are powered by the power source 12. The delay line 9 consists of R - chain This includes the capacitor 13 and the contact 14 (Fig. 2). The device for implementing the proposed method works as follows: The radial component of the cutting force Px, which varies within the frequency range, Pvjpax P of the workpiece, is constantly monitored with varying allowance (see Fig. 3). The minimum value of the force Ps indicates the minimum cross section of the cutting chips 3. In connection with the existing, 1 with a certain distance from the cut zone; before the crushing zone, the crushing is carried out with some delay, and the time of the fallout is determined from the formula 3-V, where V is the cutting speed; d is the diameter of the workpiece; n is the number of revolutions; E is the distance from the cutting zone to the chip breaking zone. Signal when controlling efforts Rc; arrives at the measuring device 7, the amplifier 8, the delay line 9, which, in accordance with the delay time t, includes the power source 12 and the actuator 11 for carrying out the crushing process (by mechanical means or an electric arc). Signal retention up to a certain time value is passed by R, a chain in which capacitor 13 reaches the required value and then a signal is transmitted after it is charged to resistance 14. At this moment the actuator 11 is turned on, performing chip splitting 3 An example implementation of the method of machining. The diameter of the workpiece d 30 mm, the number of revolutions p - 800 rpm, depth of cut - 1 mm (minimum), eccentricity e 1 mm, therefore, the maximum depth of cut t2 2 mm, 5 0.33 mm / rev. The value of the radial component of the cutting force on these modes varies (according to the experimental data of the authors) from 35 to 80 kg. Voltage with meter-. The device, varying from 5 to 12 mA, is amplified to a value of 50 mA. At this voltage, corresponding to the minimum value of Ru, the threshold device (trigger) is triggered, and through the delay line is fed to the actuator, the power supply voltage. In this example, the delay time is defined as -L. - 0.1 E, 14-30-800 The application of the proposed method of mechanical processing for the manufacture of the bead gear of the MTZ-5O tractor allowed e1T to reduce the power consumed to carry out the process of splitting the gtrugi, significantly reduce energy consumption of energy, and also to increase the reliability and durability of devices intended for mechanical crushing, due to the reduction of efforts in the separation of chips into elements. Claims of machining, in which the converging chips are sent to the zone of its division into elements, characterized in that, in order to reduce energy consumption for chip separation during the processing of blanks with variable allowance, the cutting force is controlled during the cutting process, and crushing of chips is carried out in its minimum cross section with a time delay after the specified cutting force reaches its minimum value by an amount determined from the relation S where V is the descent rate chips; - distance from the cutting zone to the crushing zone. Sources of information taken into account during the examination 1. USSR author's certificate No. 651897, cl. B 23 B 25/02, 1979. g 13 -il-cz}